.container {
    display: flex;
    width: 800px;
    min-height: 500px;
}

.sidebar {
    width: 200px;
    background: #f5f5f5;
    border-right: 1px solid #ddd;
}

.menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu-item {
    padding: 12px 20px;
    cursor: pointer;
    border-bottom: 1px solid #ddd;
}

.menu-item:hover {
    background: #e9e9e9;
}

.menu-item.active {
    background: #007bff;
    color: white;
}

.content {
    flex: 1;
    padding: 20px;
}

.page {
    display: none;
}

.page.active {
    display: block;
} 